Furnace front



my s, w26. H. A. THOMPSN #URNACE FRONT Filed Deo. 26, 1924 2SheetsmSheet l Patented July 6, 1926.

HERBERT ALEXANDER THQMPSON, OF lvORPETI-l, ENGLAN), ASSIGrNOR OFONE-HALF TO SWINNEY BROTHERS LIMTED, OF M ORPETH, ENGLAND, A BRITISHCOMPANY.

FR/NACE FRONT.

Application led December 26, 1924, Serial No. 758,187,

This invention relates to furnace fronts for furnaces working undernatural, assisted, or closed stokehold draught and the invention has forits objectto provide an 5 improved furnace front for such furnaces ofthe type which are convertible for burning Veither coal or'oil or may beused for burning coal and oil simultaneously.

The improved furnace fronts are also of io the type wherein oil burnersfitted with coaxial air directing cones are arranged at an angle inrelation to a central Vcoal burning fire door. 1

A ,furnace front of the type referred to and made in accordance with thepresent invention comprises the combination with the lire opening and anair directing cone of an intermediate angular or wedge shaped filling inpiece or extension from one of said parts whereby the said air directingcone is mounted upon the lire opening in xed angu lar relation thereto.-

As an eXample,-two air directing cones may be employed each providedwith an outwardly extending angular or tapered boss, the outer face ofwhich fits against the side of the fire opening and is secured theretoby bolts or studs, or other such like fastenings.

The said air directing cones are preferably provided with an obliquecircumferential flange adapted to fit against the inside face of theinner plate of the furnace front so as to make an airtight jointtherewith assisted if required by interposed packing material. p

A furnace front having two air directing cones, made and fitted as abovementioned, may be provided with an air chamber divided into right andleft hand chambers Y by a central division plate so that each airdirecting cone and its oil burner are located in or fed by separate airchambers.

Dampers such as hereinafter described F may be l'itted to the chambersof the furnace front, the fire door and the ash pit cover plate which isused when firing with oil.

The accompanying drawings illustrate one construction of improve furnacefront carried out in accordance with the present in- Vvention,

Fig. l is a front elevation half in section,

Fig. 2 is a sectional plan,

Fig. 3 is a central verticalsection of Fig. l, on line 3 3.

and :h1 Great Britain November 19, 1924.

Fig. at is a sectional burning front,

Fig. 5 is a separate sectional view of one of the hinged dampers.

Fig. 6 is a sectional detail showing a cover plate fitted to the oilburner air cones when the furnace is being fired with coal alone,

Figure 7 is atletail plan view of one of the directing cones.

Figure 8 is a detail plan view of the same, and

Figure 9 is a vertical section through the furnace front takentransversely of the fur` nace and showing a modification in the framestructure.

In the construction shown, a is the air director, or cone, hereinafterreferred toas the air directing cone, which may be of any suitableshape, to suit the space available.

In order to ensure accuracy in the setting of these air directing conesa so that they will properly register with the axes of the oil burners bthe side of each air directing cone a is made with an outwardlyprojecting angular or tapered boss a which is arranged to be secured tothe wall or side of the fire opening d, by means of bolts or studs CZ,or other such like fastenings.

The said air directing cones a are each provided with an oblique flangee adapted detail showing a coal dead plate fitted to the furnace to fitagainst the inside face of the inner plate o of the furnace front.

This arrangement ensures perfect setting of the parts and enables thefurnace front to be assembled all ready for fitting to the ,Inner steelplate c instead of the cones .z having to be attached to the said platec as is usually the case.

The small oblique flange c abuts against the inner side of the plate cand maintains an air tight joint therewith. If required suitable jointngmaterial may be inserted between the two faces.

The body of the furnace front is preferably made with the fire opening dand a v division plate g in one casting, but if desired for conveniencein the manufacture, as shown in Figure 9, the casting may consist ofright and left hand portions, each cast with a vertical plateA whichwhen brought together and the parts bolted up, as at f', form onecomplete semicircular front with a division plate g.

The underside of the body f of the -furnace front is preferably madewith a flange such as 7a, Jor the purpose ot securing the casting to theinner steel plate c and also in carrying with the same bolts or studs orthe dead plate a' (Fig. el) for use when coal burning.

'Qhe necessary air for combustion in the il burners which are situatedin the air directing cones i is admitted to the inside of the airchambers on the body ot' the furnace front by means oi' pivote-:l platesor dainpers y' which are so mounted that their lower edges open inwardsand direct the air downwards.

ri`hese regulating da'nipers j are mounted on square bars or hinges j',the ends ot which are made circular to act as pivots or hinge pins andare received within securing lugs la tastened to the front ot the bodyj' by means of studs or bolts.

A small knob or handle Z is titted to the damper plate vtor the purposeot operating the same, and thumb screws mA are also provided 'for thepurpose ot adjusting and rigidly securing the damper pate either in theopen, closed, or any intermediate position.

Suitable sight holes f/i are titted consisting of mica, plates or othertransparent material so that the attendant may be able to observe theliaine at the burner end, these sight holes n being situated in theJiront tace oithe casting f so that they are within the diameter or areaot the air directing cones a.

rlhe tire opening (Z is closed by means oi' any suitable type ot coalburning door, that in the drawing being of the hinge type. To this coaldoor however is itted a small pivoted damper j similar to that abovedescribed. Below this damper j is arranged a a small hinged door o whichis provided principally as a means of access tor passing in a lightedtorch when lighting up the oil burners. This door o may be iitted withmica plates or other transparent material to t'orm a sight hole.

A semi-circular plate lv is provided for the purpose of closing up thelower half of the Vfurnace opening when oil burning. This plate p hasfitted to it a traine g which lornis an air opening through the plate.The said air opening is controlled by means ol' another pivoted dampersuch as previously described.

To the traine g are also itted lifting handles q', these handles beingpreferably of inild steel secured in the iframe g when casting the same.

W'henit is desired to burn coal only with the improved i'urnace front,closing plates fr are employed for covering the inner end or opening ofthe air cones a; these plates are o'i' similar shape to the 'air conesand they are provided with holes il to allow ot' a small circulation ofair through these plates to keep the saine cool. The plate r inay besecured in position by the simple :irrangenient of bolt carried throughthe burner holder ZJ aiter the burner Z; has been removed.

rEhe operation of the improved furnace 'li'oiits t'or oil burning is asfollows Suitably heated oil having been lcd to the burners b which areinserted through the cones u, and which burners may be ot any desiredtype, the air control dainpers 'i are opened to the desired extent whichallow; air to pass within air chambers of the body rthese pivoteddaiiipers 7' cause the air io be thrown against the plate c so that theair fthe surface of saine cool.

is caused to circulate over i. c l 1, die said plate and neep the f Y1 1`f` v v l 1 ne air Liicn passes down within the body j* and having beenraised in temperature through its circulation over the plate c is thentree to'pass through the cones a and mix with the oil spray troni theburners,

The ashpit damper plate is also opened a desired amount and this beinghinged in :in inward and upward direction air to pass upwards towardsthe burners 5.

i lighted torch is inserted through the small door o to startcombustion.

The sinal control damper j in the lire door is provided ot air tocirculate within the coal tire opening d to destory any vacuuin el'lectwhich may arise through this opening being towards the rear ot' theburners, it having been found that where this door is lierineticallysealed there is a tendency for the flame troni the burners to be drawnback lo the lire opening and cause damage through local heating.

It has been found that the necessary small quantity ot air may besnitabl)v admitted through the damper j in the lire box.

What I clain'i as iny invention and desire to secure by Letters Patentiszl. "iurnace front ot the type referred io comprising the combinationol a tnrnacc lront toi-ined ot' an inner plate provided willi aperturesand an outer casting coniprising the tiringl opening and enclosing anair heating chamber. oil burners li'icatcd one on each side 'ot thetiring opening, 'air directing cones arranged consi-all; with said oilburners and each provided with an outwardly extending angular boss andan outer oblique circumferential flange, means for attaching saidangular bosses t'o the sides of the lire opening casting wherebwsaid airdirecting cones are mounted in lixed angular relation to the sides otthe tire opening casting and with their oblique circumferential flangesfitted against the inside face of the inner plate otl the furnace front.

A furnace iront of the type referied to comprising the combination of, afurnace 'front formed ot an inner plate provided causes tlic to allow asinallipiantity lou fil)

Sli

with apertures for receiving the air directing cones and an outercasting comprising a firing opening and enclosing an air heating chamberdivided by a central partition lcated above the firing opening, oilburners located one on each side of the firing opening air directingcones arranged coaxia-lly with said oil burners and each provided withan outwardly extending' angular boss and an outer obliquecircumferential flange, means for attaching said angular bosses to thesides of the fire opening casting whereby said air directing cones aremounted in fixed angular relation to the sides of the fire openingcasting and with their oblique circumferential flanges fitted againstthe inside face of the inner plate of the furnace front.

3. A furnace front of the type referred to comprising the combinationof, a furnace front formed of an inner plate provided with apertures andan outer casting comprising a. firing opening and enclosing an airheating chamber divided by a central partition located above the firingopening, a down- \\f'ardly extending flange on the lower part of the airchamber casting and means for securing said flange to the inner plate ofthe furnace front and bolts for detachably securing a coal burning deadplate to the inner side of the said inner plate and to said downwardlyextending flange, oil burners located one on each side of the firingopening, air directing cones arranged coaxially with said oil burnersand each provided with an outwardly extendingl angular' boss and anouter oblique circumferential flange, means for attaching said angularbosses to the sides of the fire opening casting whereby said airdirecting cones are mounted in fixed angular relation to the sides ofthe fire opening casting and with their oblique circumferential fiangesfitted against the inside face of the inner plate of the furnace front.

l. A furnace front of the type referred to comprising the combinationof, a furnace front formed of an inner plate provided with apertures andan outer casting comprising a firing opening and enclosing an airheating' chamber divided by a central partition located above the firingopening, a downwardly extending flange on the lower part of the airchamber casting and means for securing said flange to the inner plateoi" the furnace front and bolts for detachably lsecuring coal burningdead plate to the inner side of the said inner plate and to saiddownwardly extending flange, oil burners located one on each side of thefiring opening, air directing cones arranged coaxially with said oilburners and each provided with an outwardly extending angular boss andan outer oblique circumferential flange, means for attaching saidangular bosses to the sides of the fire opening casting whereby said airdirecting cones are mounted in fixed angular relation to the sides ofthe fire opening casting and with their oblique circumferential flangesfitted against the inside face of the inner plate of the furnace front,a detachable cover plate for the ash pit opening, pivoted air admissiondampers for the air chamber the lire door and the ash pit cover plateused for oil burning, consisting of plates mounted on hinged bars andprovided with operating knobs and adjusting thumb screws.

A furnace front of the type referred to comprising the combination of, afurnace front formed of an inner plate providedV with apertures and anouter casting comprising a firing opening and enclosingan air heatingchamber divided by acentral partition located above the firing opening,a downwardly extending flange on the lower part of the. air chambercasting and means for securing said flange to the inner plate of thefurnace front and bolts for detachably securing a coal burning deadplate to the inner side of the said inner plate and to said downwardlyextending flange, oil burners located one on each side of the firingopening, air directing cones arranged coaxially with said oil burnersand each. provided with an outwardly extending angular boss and an outeroblique circumferential flange, means for attaching said angular bossesto the sides of the fire opening casting whereby said air directingcones are mounted in fixed angular relation to the sides of the fireopening casting and with their oblique circumferential flanges fittedagainst the inside face of the limer plate of the furnace front, adetachable cover plate for the ash pit opening, pivoted airl admissiondampers for the air chamber the fire door and the ash pit cover plateused for oil burning, consisting of plates mounted on hinged bars andprovided with operating knobs and ad]- Listing thumb sc ewsj means forsecuring the detachable ash pit cover plate beneath the edge'of saiddownwardly extending flange on the furnace front casting nd clampsmounted on said downwardly extending flange and bearing on thedetachable ash pit cover plate. Y

HERBERT ALEXANDER THOMPSON.

